Leather-punch.



No. 788,022. PATBNTBD APR. 25, 1905.

J. E. COOPER.

LEATHER PUNCH.

APPLICATION FILED JAN. 3. 1905.

INVENTOR:

UNITED STATES Patented April 25, 1905.

PATENT OEEIcE.

JAMES E. COOPER, OF PERRY, NEWV YORK, ASSlG-NOR TO ROBESON CUTLERYCOMPANY.

LEATHER-PUNCH.

SPECIFICATION forming part of Letters Patent No. 788,022, dated April25, 1905.

Application filed January 3, 1905. Serial No. 239,326.

To n.// wit/mt 2'25 may concern/.-

Be it known that l, Janus E. COOPER, a citizen of the United States, anda resident of Perry, in the county of Wyoming and State of New York,have invented certain new and useful Improvements in Leather-Punches, ofwhich the following is a specification.

This invention relates to a leather-punch, and is shown in the form of ablade for a pocket-knife.

lthas for its object to provide a punch-blade that is strong, easilysharpened, and when used as a knife that is well adapted to enter thehandle of the knife when closed up.

in the drawings, Figure 1 is a top view of the knife with itspunch-blade open. Fig. 2 is a side View of the knife and punch-bladeopen, and Fig. 3 is a section on the line 3 3 of Fig. 2.

The punch-blade is represented by 1, and the handle of the knife, towhich the blade is attached and into which it is adapted to shut, by 2.The punch-blade tapers from the haft, by which it is pivotally attachedto the handle in the usual way, to the point 3 at its end, as shown inFig. 2. The lower edge et of the blade is the cutting edge and is inline with the handle 2. The upper edge 5 of the blade is approximatelystraight and forms an acute angle with the cutting edge 4 at the point3. As shown in the cross-section, Fig. 3, the inside 6 of the blade is aflat surface, while the outside 7 is curved outwardly in the arc of acircle. The groove that extends along the lower edges. of the bladereceives and carries away the particles of leather that are cut out bythe punch. The concave surface 8 of this groove, also out in the arc ofa circle, gradually approaches and finally intersects the convex surface7 of the back of the blade, forming at the line of intersection thesharp thin cutting edge 4:. The point of the blade is sharp, asexplained, so that it can be inserted in the leather where the hole isto be cut, and the edge formed by the intersection of the convex outersurface and the surface of the groove is adapted to scoop away theadjacent leather, and so to form readily a circular hole. The taper ofthe blade adapts it to enlarge the hole to the size desired.

The fact that the concave surface of the groove and the convex surface 7lie close together for some distance before they meet in the edge 4:renders it easy to sharpen the edge when it becomes dull, and,furthermore, wear upon the convex side 7 near the edge t tends tosharpen the edge 4:.

W hat I claim is- A leatherpunch consisting of a tapered blade that isflat on one side, and on the other is curved outwardly in the arc ofacircle, and that has at its lower edge a groove also cutin the are of acircle, which intersects the convex side of the blade to form a cuttingedge, substantially as shown and described.

JAMES E. COOPER.

WVitnesses:

C. M. SMITH, I. S. RoBusoN.

